Fuse



H.V H. BAKER'.

FUSE.

APPLICATION man rEB.25.192o.

1,405,254. Patented Jan. 31, 1922.

NE i ,219 F msmwie ggg/Mw@ All -murali .STATES PATENT QFFICE HOWARD i1. BAKER, orBUFrALo, NEW ironiaAV l T 0 all whom it may concern Be it known that LHowARD BAKER, a citizen of thellnited States', residing in Buffalo, in the county of Erie and AState of New York, have invented vnewand useful lowing is a specification. i This invention relatesto a fuse, more par# ImprovementsfinF 11565,' 0f Which th? ifol ticularly of the knife blade type, in whichV the :fuse linkl is capable of being renewed lwhen the same is blownout. f .It is the object of Vthis invention to proimproved means for detachably.connecting duce afuse df this vtype in which the fusing of the linkv is positively confined to the center yor blowout portion of thelink and the flame, fire and heat generated during the blowing ofthe fuse is confined to the central portion of thebox of the fuse and' prevented `ifrom reaching the terminals. VThis invention has ythe furtherobject to vprovide the ends ofthe fuse link with the terminals so 'as t0 ensurefa perfect `contact between the same, also; facilitating theeasy insertion and removal of. the link, alsotoprevent a link fromy being improperly ,applied and also to prevent any link other thanv the. one de@ signed fora particular fuse from being used, and thus avoiding lthe possibility of overloading themachine which is to be supplied Vwith current through the respective fuse. Y f f In the accompanying drawings: Figure l .is a vlongitudinal sectionof a! fuse embodying n iy improvements', F ligurev 2 is a planview of Athe saine with the cover removed.' Figiii-es?)v and 4 arecross sections, on anV en lai-ged scale, take-n on the correspondingly numbered lines in Fig. l. Fignre is a perspective view of one ofthe linkclamping or fastening jaws used in the construction shown in Figs. 1 4., f Figure 6 is afragmentary longitudinal section, on' anenlai'ged scale, vtaken on line 6-6,`Fig. 2. Figure 7 is a perspective view of Athe form of link used inthe construction shown in Figs. l Yand2. Figure' 8 isa cross section similar to Fig.V 4f, but showing a niod'ificationzcf the means for .fastening the fuse link to a terminal. Figure 9 is a perspective view of ythe link clamping jaw shown vin .Fig; Y8. Figure l0 is a perspective view of a modified Spcciation of Letterslatexitf V -Patented J a-Iyl. V31, 1922. Appiication nica February 25, '1920.` serial No. 361,155.

Fig. '110 between a clamping jaw and a tei'- minal. f f

Similar characters of reference refer to like parts throughout the several views. I The preferred formV of the fuse box shown in the vdrawings comprises a lower body 2() and' ay cover 2l which are arranged length-v wise side by side and -aredetachably con# Y nected with eachother by means of spring catches22 mounted on oppositeV ends of the body and engaging shoulders 23v at 0pposite ends ofthe cover. Y

The Vopposing inner surfaces of the body Vand cover are hollowed out so as to form` a chamber 24'be'tween the same'when assembled and to facilitate alinement thereof Mountedon, opposite'ends of the box are two terminals 27 preferably of copper which are secured respectively to the inner sides ofthe endportions ofthe body by means of yscrews 28 passing through the terminals and into screw nuts 29 anchored in the body. Each ,of these terminals v is so mountedv on the body thatl itsouter end projects beyond Vthebody and forms a contact blade which engages with aco'rresponding socket or seat on the fuse block, while the inner end of l veach terminal is arranged within the adj a- *cent end of the fuse chamber 24 and is adapt ed to be connected with one end of the fuse vlink 30. VVThe latter may be of anysuitable construction, but in they form shown inthe drawings, the same is constructed of flat fusible metal so as to form two comparatively wide end portions whiclrare,connect` ed respectively withrthe innerends of the terminals'vv and a reduced or narrow central Y' blow-out portion 3l which is jadapted to be fused or blown bythe passage of an eX- `cess electric current through the same and thus save harmless the apparatus-with which the fuseis associated.

'1n order to confine the blowing out'or fusing of the fuse link to the central part V'31 thereof, the parts of the fuse link inimediately yadjacent tooppositesides of this "Vf-V30 linkandftherebyurther-reducing-the possi? bili V of the@aine:andV heatyreaehing. theV Iii. 2:

:non-'combustible Y i i. Y Y shown atV 32,7Whic`h' maybe "applied either eentrallpart are eoatedforf eoyeredwi h ai insulatiiig inateriak as from vone side only .ofthe fuse link 'or-to Vboth rsides thereof as shownin Fig. l, or

:i1/strip4V ofMthisxmaterial ,bejyrapped vpart 31 thereof and thus prevents theflane or. heat;fromfreaehingthe terminali f2?,- so

Vthatthe latter; and the means for eonneoting :fthe yfuse.linktheretoarenotinjured.V

A. jlnorderpto still ffurth'er guard against the; possibility. of Ithe arne or heat;v which isfgeneratedxd-ung the` blowing vof-the fuse fromeaehgofzthe terminals andthe means Y i for fastening-the fuselink.theretofea'ohiof the box'nieniberseomprising @over and body are provided at theirvinner.opposingsidesV Y Withs pockets 33. Whiohare VindependentV .of

lterrrlnal-s` l i' YTostilli .further guardagainst thegpossi-V` bility ofriaine reaehingthei terminals when cthedamphajaws fort Y ingg'a ffuseilink vyyfhichiis vheayierthan `.the `Vonejforgwhich;itis' designedandtoearry a eorrespondingly heavier.oulfrent,lmt such the chamber 24 in the fuse box, WhiehY po'ek;

f. ets, inr 'the/)assembled :position Sof thegbox,V

faceV .each-othersV and. enclose Vbetween them.

the central` portiongof :the ifuse dink; as shown in. Fig. l', .therebyfoutting Voflffathis' part of.

the-:interior of the-:boX-'from thefsurrounding space eontainingzthe/ innerends of .thei'v terminals and-thejend portionsV ofjtheuse i i i ,nal .edges' ..off V the flink :are Lproyided with 'notches Ll1.,w'vithwhich the Vserews theyoentral kpart oijthefuse link blows, two. padsV 34k of insulating 'material,l1suoh as asfV .bestes7 -arejseated in fthe pocketsV 33 and; are

I adapted'ftofengagegwithopposite.*sidesfof 40T duoe toiamininiumthe-.presence'of any'air Y 4aVcljaeeiltltozthe VCentralpartof;the'linkfso il l that-any `tendency tofprodueeagameewhen I J blowingA of fthe Viuse is promptly vsmotheredv and gtheyterrninalsj of the fuse saved Yfrom inimfya v Y. y --The Irneansr-forr attaohing theends of. .the

Y fuse link to theinner.endsof.theterrninalaV I 'as' Shown'. 2a: 4a f5@ Y aniareonf structedyasjrfollows: i n I Y 13535 represent tivofgxfastening `o1olzur1pf` ing: j aws 1Whiehjare Vmirangedtransversely of Ythe. Y,inner end portions `of: the fterrninals, 1 one -endjV of the fuse link beingadlapte-dto :beg gripped between the under-.side .of .feaeh v of ,these fj a-WsV and. the uppergsurfaoe Voi tliej i' -innerlend o f'one ofthe-terminals; Inorder t'cnerienrr, aiull and propericontaet between A .the `,fuse link Aeach-lof the .teiuninalsgtheV outerfend V4of eaeh fofatheg, Clamping awe-is -proyidednwith a.downwardly*.fprojeeting heel yhiclrgres'ts o n'the upper 'surfa'oeof Y the respectiye'terminaladjacentto, one long-jVV Y:gitudinal'"edge-thereof; asshownin Figi@ Y that this'jaW When'presseddownwardlyfV 37 as a ulerum and thereby produce a Wide area .ofi-"foontaetfbtiveen opposite sides of Y ...the fuse link and theopposing front endv of I 'the jaw on vthe' upper side of the terminal -jijhieh. operates to effectively conduct the eleetrio'eurrentagainst'-1the :fuseilinkgisfl preferably produced Y 4by Ineans of a .soreiyV 38 secured With its j The Y pressure of ith@ .j LW

10W@ part t0 ,the-terminal' andppeSSllsWth.

its :upper partgthro'ugh anopen1ng 'infthe damping-@jaw .aand provided with a" serew nut .39; on its' upper part wxhichbears against the upperideVV .of the :clamping jaWgi. Com# pleteremoyal of -thenutj` 39- zfronifthe .sereW 38 is prevented by proylingL-thellatter with afstopcatlits upperend-Whieh `isiadapted its proper4 place .between the1undersides,.of

the termnals thesev velennentsenga-ge .with

and fterminalgthe .corresponding longitudi-- fltfrnay Vbe .attempted .to'fastel the of the. fuse; link aeeinstjthe Yupper "Surface:

'an -atfrnpt- Y`is, prevented V7by proyiding the' rTheaendslofthefuse ,areipreierably l Y Of.; such width SQ that when 4the. .saine is in Y ends `f o frontend oteac'h'jaWfwith an upper. re-

yersely bentguard tlange 'or'gliplZ- .Whvioh letter ,is f Sieh .length .that texte/eds' over. arconlsiderable part of the upper .surfaoefof the j awp." and [renders .it v1 ineo'nyenient :to

' vchangea.fuse-.link oeX/oessiye size against` vthe upperzside 'of theqaw; and a cur.-

peperlylfieigneirif orderrto:V reyent he rear end 'of the clamping, jaw;.from'."oeeoining"` displaced .Y

lengthwise oifthef-terminal,V `thisf end i's pro-V vide'd Vwith a .downwardly proj eeting retain# Eine' hief 4.3 which'.lgagewtllle[11011D1144 orrned :in i. thei5YeorrespendingY edge f of theY terininaL-as'rshown 'Figsg'andilfl Y j Y fl'nV order .to utilize"the'resilienoe Voffthe Vel'zmiping .jawand eausethefsainefto open or riseautornatically when looseningthe corn- 'panio'n screw '3,9 the .louferlend of thelug'f" 'f is '.proifidedlwith fa forwardly 'projecting atg side ofthe terinifnalby headiof the; screw". i

- as well as the removal `thereof is facilitated,

inasmuch as the clamping jaw does not require manual lifting for this purpose. If desired, however, the attaching car may be omitted, as shown in the construction of the `retaining lug 46 in Figs. 8 and 9 which construction, however, possesses all of the other advantages of the fuse link fastening means above referred to. Y

The space between the undersides of the clamping jaws and the upper sides of the terminals when the jaw is wide open is so determined, that .the same will permit theV easy insertion and removal of a fuse link of the proper thickness but which will prevent the insertion of a fuse link therebetween which is of'a thickness in excess of `that for which the fuse is designed, thereby v further guardagainst the insertion of an improper fuse linkv between the terminals. and the clamping'jaws, the surfaces at opposite ends of the fuse linkA and the co-op'erating surfaces of the clamping jaws are constructed of commutation or combination form so that only those fuse links having a commutation surfaceA corresponding to thosel of the clamping jaws will be capable of usein the fuse. In the form. of these commutation surfaces shown in Figs. 2, 5, 6 and 7, the underside of each jaw is provided with one or more commutationprojections 47 Vwhich are adapted to engage with commutation notches` 48 in the longitudinal edge portions of the fuse link which contain they screw receiving notches 4l. yThe projections 47 and notches 48` are'so placed relatively toV each other that they will engage properly with each other upon assemblingV the parts and pressing the clamping' jaws downwardly from the ends of the fusey link as shownin Fig. 6. These complementary Vcaooperating surfaces of the jaws and fuse link are, however, vdifferently located in fuses'. of different' capacity, thereby preventing kthe introduction of a fuse link of one capacity from being properly applied'to the-terminals of a fuse of Y another capacity and thus guarding against shown'inFigs. 2, 5, 6 and 7, for instance as improper use of the fuse.

These complementary commutation surfaces of the fuse link and the clamping jaws may bel varied in many Aways from that shown in Figs. 10 and 11, the fuse link may be provided at its opposite ends with transverse corrugations 49 which are adapted t0 ybe received by transverse grooves 50 on the each having an outer and an inner end, andA means for connecting the opposite ends of a fuse link to the inner ends of both terminals l comprising two clamping jaws, each mounted at one end on one side of a terminal and provided at its opposite end with an upper reversely turned flange, and a screw connecting said jaw between its ends with said terminal and Vadapted Ato press the latter terminal against opposite sides of one end of the fuse link.

2. A fuseV 'comprising a box, fterminals mounted on opposite ends of the box and each having inner and outer ends, the inner j end of each terminal being provided on one j of its longitudinal edges with anotch, clamping jaws each arranged transversely of the inner end of one o f the terminals and provided at its'rear end with a lug arranged in said notch, the front end of said jaw being adapted to press an end of the link against the upper side of the respective terminal, and a screw'connecting each jaw-with the adjfacent terminal. y

3. A` fuse comprising a box, terminals mounted on opposite ends of the box and each having inner and outer ends, the inner endl of each terminal being provided on one of its longitudinal edges with a notch, clamping jaws each arranged transversely ofthe inner lend of one of the terminals and provided at its rear end with a lug arranged in said notch, the frontend of said jaw being adaptedkto press an end of the link against the upper side of therespective terminal, an eararranged on the lower end of said lug and engaging with the underside of the adjacent terminal, and a screw connecting the ear with said terminal and provlded with a vnut adapted to press the jaw against a fuse eoV 

